/// <summary>
/// Requirements:
/// (1) all the data points are indexed from 0 ... cDataCountsTotal
/// (2) all data points belongs to one group are contingious
/// </summary>
/// <param name="groupId">maps a data point to its group ID</param>
public DataGroups(LabelFeatureCore labelFeatureCore)
{
NumDataPoints = labelFeatureCore.NumDataPoint;
List<int> listGroupId = new List<int>();
List<int> listStartIdx = new List<int>();
listGroupId.Add(labelFeatureCore.GetGroupId(0));
listStartIdx.Add(0);
int curID = labelFeatureCore.GetGroupId(0);
for (int i = 0; i < NumDataPoints; i++)
{
int nextID = labelFeatureCore.GetGroupId(i);
if (nextID != curID)
{
listStartIdx.Add(i);
listGroupId.Add(nextID);
curID = nextID;
}
}
groupCounts = listStartIdx.Count;
dataGroups = new DataGroup[groupCounts];
for (int i = 0; i < groupCounts; i++)
{
dataGroups[i] = new DataGroup();
dataGroups[i].id = listGroupId[i];
dataGroups[i].iStart = listStartIdx[i];
if (i < groupCounts - 1)
{
dataGroups[i].cSize = listStartIdx[i + 1] - listStartIdx[i];
}
else
{
dataGroups[i].cSize = NumDataPoints - listStartIdx[i];
}
}
}
